If you are talking about what number, it would be 999,999,999,999
If you are talking about what set of numbers it would be the billions
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Trillion comes before quadrillion
Quadrillion comes after trillion. If you add one to a trillion, the number becomes a trillion and one, a trillion and two, etc.
A trillion and 1
A trillion and one.
Quadrillion comes after a trillion. There are 15 zeroes in a quadrillion. There are 12 zeroes in a trillion.